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Cobalt immobilization performance and mechanism analysis of low carbon belite calcium sulfoaluminate cement

Journal Article (2023)
Author(s)

Lin Chi (University of Shanghai for Science and Technology)

Mengxuan Li (University of Shanghai for Science and Technology)

Qianrui Zhang (University of Shanghai for Science and Technology)

X. Liang (TU Delft - Materials and Environment)

Chendong Huang (University of Shanghai for Science and Technology)

Bin Peng (University of Shanghai for Science and Technology)

Haisheng Sun (University of Shanghai for Science and Technology)

Research Group
Materials and Environment
Copyright
© 2023 Lin Chi, Mengxuan Li, Qianrui Zhang, X. Liang, Chendong Huang, Bin Peng, Haisheng Sun
DOI related publication
https://doi.org/10.1016/j.conbuildmat.2023.131545
More Info
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Publication Year
2023
Language
English
Copyright
© 2023 Lin Chi, Mengxuan Li, Qianrui Zhang, X. Liang, Chendong Huang, Bin Peng, Haisheng Sun
Research Group
Materials and Environment
Volume number
386
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Cementitious materials are well acknowledged as one of the most adaptable materials for immobilizing heavy metals. Belite calcium sulfoaluminate cement (BCSA), one of the low-carbon alternative binders to cement with superior properties regarding chemical resistance and mechanical properties, is found with a desirable capability for waste immobilization. In this study, BCSA was used for Co(II) immobilization with a dosage of up to 2.5% by weight of BCSA. The results showed that Co(II) could promote the hydration of BCSA pastes, specifically accelerated the hydration of ye'elimite. More hydration products could be generated in the Co(II)-doped BCSA pastes, leading to the construction of a denser microstructure. The compressive strength of BCSA pastes would be slightly improved when BCSA was used for Co(II) immobilization, and the electrical resistivity would decrease. In terms of Co(II) immobilization, BCSA cement exhibited a desirable capacity for Co(II) immobilization. The majority of the Co(II) could be immobilized within the first 100 min of mixing BCSA with Co(II) solutions. The immobilization degrees of Co(II) in hardened BCSA pastes could approach about 99.99% after 7d. The acquired results indicated that BCSA cement is effective for Co(II) immobilization. Therefore, BCSA has a low-carbon advantage with superior strength development over time and prospective capacity of heavy metals immobilization.